the principal initial hole factors influencing primary section trajectory, such as sidetracking position ( formation factors ), primary deviating angle and primary azimuth of the sidetracking position are analysed by spatial plane-tilted method 文章运用空间斜平面法分析了对侧?水平井起始段有重要影响的主要初始井眼条件,包括侧?点(地层因素)、侧?点初始井斜角、侧?点初始方位角等对起始段轨迹的影响。